Radiation heat transfer coefficient, object to duct

Radiation heat transfer coefficient from cable surface to inner wall of the duct used for riser/J-tube.

Symbol
$h_{rad,od}$
Unit
W/(K.m$^2$)
Formulae
$4\sigma K_r \left(\frac{\theta_e+\theta_{di}}{2}+\theta_{abs}\right)^3$
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